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CGP EDU Academic Team
Published on: August 12, 2026
Write and explain the order of X–X bond energy for halogen down the group.
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Enthalpy of dissociation (x-x)/kJ mol –1
Cl–Cl > Br–Br > F–F > I–I, Smaller enthalpy of dissociation of F 2 is due to relatively large electrons-electrons repulsion among the lone pairs in F 2 molecule.
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